A Modular Hybrid Switching Amplifier for Wide-Bandwidth Supply-Modulated RF Power Amplifiers

R. Perea-Tamayo1, O. Bengtsson1, P.N. Landin2, and W. Heinrich1

Published in:

7th German Microwave Conference (GeMiC 2012), Ilmenau, Germany, Mar. 12-14, paper 1510 (2012).

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A modular hybrid switching amplifier (HSA) for wide-bandwidth supply modulation of RF power amplifiers is presented. The HSA is designed for maximum 15 V supply voltage, 1 A supply current and 10 MHz bandwidth. The purpose is to compare alternative switch technologies. A case study is conducted on GaN-HEMT and Si-MOSFET, which are compared with regards to efficiency and linearity under different load conditions, based on simulations and on measurements of the fabricated designs. Design modifications to accommodate the alternative switch technologies are presented together with analysis of non-linearities including slew-rate induced amplitude distortion.

1 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
2 University of Gävle, Dept. Electronics, Mathematics and Natural Sciences, Kungsbäcksvägen 47, 80 176 Gävle, Sweden

Index Terms:

EER, Envelope tracking, hybrid switching amplifiers, power amplifiers, supply modulation.